Lens mount for optical instruments



Feb. 5, 1924. 1,482,893

E. HART LENS MOUNT FOR OPTICAL INS'I'RUMENTS Filed oct. 2o, 1920 l" l Il I H HI x I Patented Feb. 5, 1921-2-,

EDWIN HART, 0F ROCHESTER, NEW YORK, ASSIGNOR "EO BAUSCH t LOMB OPTICAL COMPANY, OF ROCHESTER, NEW YORK, l CORPORATION 0F NEV YORK.

LENS MOUNT FOR OPTCAL INSTRUMENTS.

Application filed october to, i920.

To all whom t may concern:

Be it known that l, EDWIN HART, a citizen of the United States, and resident oi Rochester, in the State of New York, have invented new and useul Improvements in Lens Mounts for @ptical Instruments; and l do declare the iollowingk to be a full, clear, and exact description of the same, reference being had to the accompanying drawings forming a part of this specification.

My invention relates to lens mounts Jfor optical instruments such as binoculars, telescopes, microscopes and the lilre. ln instruments of this kind it has been found that the oil used in lubricating the parts is liable to work into the body of the instrument and smear its lens surfaces. lt has also been found that in screwing and unscrewing the tubes ne particles of the metal are liable to flake off and get on the optical surfaces. This difficulty is especially hard to overcome as the particles cannot be removed without unscrewing and again screwing up the tubes with the result that other particles are loosened which again settle on the optical surfaces of the instrument. The object of my invention is to overcome these diliiculties, by constructing a lens mount with all lubricated parts outside of the instrument body, by forming all retaining ring screw threads externally of the lens mounting or tube so that no particles can fall upon the faces or the lenses, and by distributing the screw threads for removal of optical units in a novel manner.

In the drawings,

Figure l is a front elevation of a binocular telescope embodying my invention.

Figure 2 is a transverse section or an eyepiece showing the location or the threads and connecting parts, and

Figure 3 is a similar View with the parts disassembled.

Similar reference numerals refer to the same parts throughout all the figures of the drawings.

I have shown my invention applied tothe eyepiece of a binocular telescope although it is applicable to all optical instruments employing tubular lens mounts. The eyepiece illustrated in the drawings comprises atubular support or sleeve l threaded at its end to engage an opening in the body of the binocular case. The tube l is also internally threaded adjacent its inner end to re- Seria No. @8,152

ceive a mill scale tube which is externally threaded to engage the internal threads of the tube l. rl`he outer end or the tube l is threaded as at 3 to cooperate with internal threads-on a sleeve 4; which is adjustable longitudinally on the tube l. The ends ot' the sleeve i are counterbored and internally threaded to receive a graduated collar 5 at its inner end whichserves to limit the outer adjustment oi' the sleeve e on the tube l by engaging the threads or projections 3. A tube 6 having an externally threaded outer end is screwed into the outer end of the sleeve l and has an inwardly projecting sleeve 7 having a reduced external diameter and externally threaded at its inner end. The threads at the outer end of the `tube 6 are intermeshed with the thread at the outer end of the sleeve e.. The outer end of the tube 6. is also pro-vided with a shouldered aperture 8 with which the edge ot the outer tace of the front combination lens `9 cooperates. A sleeve or tubular member l0 having a reduced outer end, and a shouldered aperture therein cooperates with the inner face of the lens 9 and at its inner end engages the outer edge of the inner iaoe of a rear combination lens ll. The sleeve 7 surrounds the sleeve l0 and at its inner end engages the edge of the lens ll. A tubular member or sleeve 13 having a shouldered aperture at its inner end engages the edge of the outer tace of the lens ll and is threaded into engagement with the external threads on the sleeve 7. By this construction it will be noted that the niembers'l, 6, and 13 are screwed together and form a unit adjustable on the supporting tube l, said adjustment being for the purpose of focusing the instrument. n

lf desired the outer end of the tube 6 may be provided with Spanner wrench holes lll by which the parts may ne unscrewed by the use of a wrench when necessary. An outer shield l5 may be screwed on to the outer end of the tube 6 into engagement with the outer end of the sleeve 4 and serves as a protection :for the i'rontv lens 9.

lt will be noted that the lenses 9 and ll 'are mounted within the externally threaded tube 6 and clamped against the opposite ends of the spacing sleeve l() by means of the tube 13 screwed into engagement with the external thread on the sleeve 7. By this construction the lenses are entirely protected lll() from any particles which may work loose from any et the screw threads en'iployed in securing the parts together'. They are also protected from a liability of oil coming in contact with their surfaces. lt will also be noted that the mill scale and its disls are so positioned within the supporting tube l as to be practically tree from any liability or particles or oil reaching them.

fr mill scale mount constructed according to my in fention is illustrated in Figure 2 ot the drawings and comprises a. spacing sleeve against the ends ot which the transparent disks 2l and 22 are clamped by the intercngaging tubes 23 and 24. The tube 23 has in internal flange E25 adjacent its outer end which engages the dish Q2, and at its inner end is counterbored and internally threaded at 26. rlfhe tube 2li is externally threaded at its inner end to engage the internal threads in the tube l, and has a circumferential flange i? adapt-ed to engage the outer end or" the he l tube 24:. rllhe tube 24 surrounds the leeve Q0 and is externally threaded adjacent its outer end to cooperate with the internal threads in the tube 23. Formed on the inner end oii the tube 24 is a diaphragm 28 which engages the inner face ot' the mill scale disl; 2l on the inner suriiace of which the mill scale is etched.

Having described my invention what l claim and desire to secure by Letters Patent is:

l. ln a lens mount for optical instruments, the combination of 1front and rear combination lenses, a tube for spacing said lenses, and means for retaining` said lenses in position on said spacing tube, said means comprising a tube adapted to engage the front combination lens and having an inwardly projecting externally threaded sleeve surrounding the spacing tube and an internally threaded sleeve surrounding said tube and the rear lens and adapted to retain the rear lens in position on the tube.

2. In a lens mount for optical instruments, the combination of front and rear combination lenses, a tube for spacing said lenses, a tube adapted to engage the front combination lens and having an externally threaded sleeve surounding said spacing tube, and a tube having an internally threaded sleeve surrounding said ef-iternally threaded sleeve and the rear lens and engaging said externally threaded sleeve and adapted to engage the edge of the rear combination lens.

3. In a lens mount for optical instruments, the combination of a supporting tube, a longitudinally adjustable tube having an inwardly projecting externally threaded sleeve; a lens spacing tube in said sleeve, a front combination lens between said adjust- 1 ,assess able and spacing tubes, a rear combination lens jjiosition'cd ag `ist the inner end oiz said spacing tube, and an internally threaded sleeve surrounding and engaging said ei;- ternally threaded sleeve and the rear lens, and adapted to retain the rear combination lens in position on the spacing tube.

et. ln a lens mount for optical instruments, the combination of a supporting tube, a longitudinally adjustable tube having an inwardly projecting externally threaded sleeve7 a lens spacing tube in said sleeve, a from combination lens between said adjustable and spacing tubes, a rear combination lens positioned against the inner end ot said spacing tube, an internally threaded sleeve cooperating with said externally threaded sleeve and adapted to retain the rear coinbination lens in position on the spacing tube and means for adjusting said adjustable tube and sleeve carried thereby longitudinally of the supporting tube.

5. ln a lens mount for opt-ical instruments, the combination ci a supporting tube, a sleeve adjustable thereon and provided with internal screw threads adjacent its outer end and a lens tube provided with external screw threads cooperating with the threads in said sleeve and carried thereon.

(5.1%. lens mount tor optical instruments comprising a tubular support, a sleeve having internal screw threads adjacent its outer end adjustable on said support, a tube threaded into said sleeve and carried thereby and having an externally threaded inwardly projecting portion, a lens spacing` device iu aid tube, and a retaining sleeve cooperating with said externally threaded tube.

7. rThe combination with a supporting tube, or' a lens tube longitudinally adjustable within said supporting tube, a sleeve secured to the lens tube and extending over said supporting tube, and means ou the outside ot the supporting tube and inside the sleeve for producinga. longitudinal adjustment between them.

8. The combination with tube, kof a sleeve carried by said tube and longitudinally' a supporting the outside of adjustable relative thereto, and a lens tube lined to said sleeve adjacent an end thereof, said lens tube projecting into said supporting tube but out of Contact with the inside thereof.

9. The combination with an externally threaded supporting tube oli au internally threaded sleeve in cooperation with said tube and rotarily adjustable relative thereto, and a lens tube carried by said sleeve adjacent and end thereof, said lens tube projecting into said supporting tube and being longitudinally movable within as the sleeve is adjusted thereon.

EDlVIN HART. 

